Oulainen

Oulainen
Town
Oulaisten kaupunki
Oulainens stad
The town center of Oulainen in 2017.
Motto: 
Syntyy ja tapahtuu.
Location of Oulainen in Finland
Coordinates: 64°16′N 024°49′E / 64.267°N 24.817°E / 64.267; 24.817
Country Finland
RegionNorth Ostrobothnia
Sub-regionYlivieska
Charter1865
City rights1977
Government
  Town managerRiikka Moilanen
Area
 (2018-01-01)
  Total
597.53 km2 (230.71 sq mi)
  Land587.84 km2 (226.97 sq mi)
  Water10.01 km2 (3.86 sq mi)
  Rank143rd largest in Finland
Population
 (2025-03-31)
  Total
6,911
  Rank134th largest in Finland
  Density11.76/km2 (30.5/sq mi)
Population by native language
  Finnish97.3% (official)
  Others2.7%
Population by age
  0 to 1417.5%
  15 to 6454.9%
  65 or older27.6%
Time zoneUTC+02:00 (EET)
  Summer (DST)UTC+03:00 (EEST)
Websitewww.oulainen.fi

Oulainen (Swedish: Oulainen, also Oulais) is a town and a municipality of Finland. It is located in the Northern Ostrobothnia region, 101 kilometres (63 mi) south of the city of Oulu. The municipality has a population of 6,911 (31 March 2025) and covers an area of 597.53 square kilometres (230.71 sq mi) of which 10.01 km2 (3.86 sq mi) is water. The population density is 11.76 inhabitants per square kilometre (30.5/sq mi). Oulainen is founded in 1865, and it received township rights in 1977.

The municipality is unilingually Finnish. The municipality has previously also been known as "Oulais" in Swedish documents, but is today referred to as "Oulainen" also in Swedish.